We are talking about headphones that cost as little as possible but get the job done. They are easy replacements for your original mobile headphones, headphones that got lost or damaged in some way. They are also something you can easily replace.
Good earbuds are comfortable. They come with a remote and microphone. They provide good sound without a big price tag. Good earbuds provide good value for your money.
The best in-ear headphones under $50: AKG Y20U (smooth, mellow sounds, comfy fit, single-button universal remote)
The second best in-ear headphones under $50: Brainwavz Delta with Mic (with Android and iPhone remote options)
The best affordable in-ear headphones under $50: Panasonic RP-TCM125 ErgoFit (under $15 price!)